1 files changed, 376 insertions, 0 deletions
diff --git a/backport-include/linux/skbuff.h b/backport-include/linux/skbuff.h
new file mode 100644
index 0000000..034206b
--- /dev/null
+++ b/backport-include/linux/skbuff.h
@@ -0,0 +1,376 @@
+#ifndef __BACKPORT_SKBUFF_H
+#define __BACKPORT_SKBUFF_H
+#include_next <linux/skbuff.h>
+#include <linux/version.h>
+#include <generated/utsrelease.h>
+
+#if LINUX_VERSION_IS_LESS(3,4,0) && \
+      (RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(6,4)) && \
+      !(defined(CONFIG_SUSE_KERNEL) && LINUX_VERSION_IS_GEQ(3,0,0))
+#define skb_add_rx_frag(skb, i, page, off, size, truesize) \
+	skb_add_rx_frag(skb, i, page, off, size)
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,3,0)
+#define __pskb_copy LINUX_BACKPORT(__pskb_copy)
+extern struct sk_buff *__pskb_copy(struct sk_buff *skb,
+				   int headroom, gfp_t gfp_mask);
+
+#define skb_complete_wifi_ack LINUX_BACKPORT(skb_complete_wifi_ack)
+static inline void skb_complete_wifi_ack(struct sk_buff *skb, bool acked)
+{
+	WARN_ON(1);
+}
+
+/* define to 0 so checks for it are always false */
+#define SKBTX_WIFI_STATUS 0
+#elif LINUX_VERSION_IS_LESS(3,18,0)
+#define skb_complete_wifi_ack LINUX_BACKPORT(skb_complete_wifi_ack)
+void skb_complete_wifi_ack(struct sk_buff *skb, bool acked);
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,2,0)
+#include <linux/dma-mapping.h>
+
+/* mask skb_frag_page as RHEL6 backports this */
+#define skb_frag_page LINUX_BACKPORT(skb_frag_page)
+static inline struct page *skb_frag_page(const skb_frag_t *frag)
+{
+	return frag->page;
+}
+
+#define skb_frag_size LINUX_BACKPORT(skb_frag_size)
+static inline unsigned int skb_frag_size(const skb_frag_t *frag)
+{
+	return frag->size;
+}
+
+/* mask skb_frag_dma_map as RHEL6 backports this */
+#define skb_frag_dma_map LINUX_BACKPORT(skb_frag_dma_map)
+static inline dma_addr_t skb_frag_dma_map(struct device *dev,
+					  const skb_frag_t *frag,
+					  size_t offset, size_t size,
+					  enum dma_data_direction dir)
+{
+	return dma_map_page(dev, skb_frag_page(frag),
+			    frag->page_offset + offset, size, dir);
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,1,0)
+/* mask __netdev_alloc_skb_ip_align as RHEL6 backports this */
+#define __netdev_alloc_skb_ip_align(a,b,c) compat__netdev_alloc_skb_ip_align(a,b,c)
+static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
+							  unsigned int length, gfp_t gfp)
+{
+	struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
+
+	if (NET_IP_ALIGN && skb)
+		skb_reserve(skb, NET_IP_ALIGN);
+	return skb;
+}
+#endif
+
+#ifndef skb_walk_frags
+#define skb_walk_frags(skb, iter)	\
+	for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,2,0)
+#define skb_frag_size_sub LINUX_BACKPORT(skb_frag_size_sub)
+static inline void skb_frag_size_sub(skb_frag_t *frag, int delta)
+{
+	frag->size -= delta;
+}
+
+/**
+ * skb_frag_address - gets the address of the data contained in a paged fragment
+ * @frag: the paged fragment buffer
+ *
+ * Returns the address of the data within @frag. The page must already
+ * be mapped.
+ */
+#define skb_frag_address LINUX_BACKPORT(skb_frag_address)
+static inline void *skb_frag_address(const skb_frag_t *frag)
+{
+	return page_address(skb_frag_page(frag)) + frag->page_offset;
+}
+#endif /* LINUX_VERSION_IS_LESS(3,2,0) */
+
+#if LINUX_VERSION_IS_LESS(3,9,0)
+#ifndef NETDEV_FRAG_PAGE_MAX_ORDER
+#define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768)
+#endif
+#ifndef NETDEV_FRAG_PAGE_MAX_SIZE
+#define NETDEV_FRAG_PAGE_MAX_SIZE  (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER)
+#endif
+#endif /* LINUX_VERSION_IS_LESS(3,9,0) */
+
+#if LINUX_VERSION_IS_LESS(3,9,0)
+#define skb_unclone LINUX_BACKPORT(skb_unclone)
+static inline int skb_unclone(struct sk_buff *skb, gfp_t pri)
+{
+	might_sleep_if(pri & __GFP_WAIT);
+	if (skb_cloned(skb))
+		return pskb_expand_head(skb, 0, 0, pri);
+       return 0;
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,2,0)
+
+#define skb_frag_address_safe LINUX_BACKPORT(skb_frag_address_safe)
+/**
+ * skb_frag_address_safe - gets the address of the data contained in a paged fragment
+ * @frag: the paged fragment buffer
+ *
+ * Returns the address of the data within @frag. Checks that the page
+ * is mapped and returns %NULL otherwise.
+ */
+static inline void *skb_frag_address_safe(const skb_frag_t *frag)
+{
+	void *ptr = page_address(skb_frag_page(frag));
+	if (unlikely(!ptr))
+		return NULL;
+
+	return ptr + frag->page_offset;
+}
+#endif /* LINUX_VERSION_IS_LESS(3,2,0) */
+
+#if LINUX_VERSION_IS_LESS(3,14,0) && \
+    RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(7,0) && \
+    !(LINUX_VERSION_CODE == KERNEL_VERSION(3,13,11) && UTS_UBUNTU_RELEASE_ABI > 30)
+/*
+ * Packet hash types specify the type of hash in skb_set_hash.
+ *
+ * Hash types refer to the protocol layer addresses which are used to
+ * construct a packet's hash. The hashes are used to differentiate or identify
+ * flows of the protocol layer for the hash type. Hash types are either
+ * layer-2 (L2), layer-3 (L3), or layer-4 (L4).
+ *
+ * Properties of hashes:
+ *
+ * 1) Two packets in different flows have different hash values
+ * 2) Two packets in the same flow should have the same hash value
+ *
+ * A hash at a higher layer is considered to be more specific. A driver should
+ * set the most specific hash possible.
+ *
+ * A driver cannot indicate a more specific hash than the layer at which a hash
+ * was computed. For instance an L3 hash cannot be set as an L4 hash.
+ *
+ * A driver may indicate a hash level which is less specific than the
+ * actual layer the hash was computed on. For instance, a hash computed
+ * at L4 may be considered an L3 hash. This should only be done if the
+ * driver can't unambiguously determine that the HW computed the hash at
+ * the higher layer. Note that the "should" in the second property above
+ * permits this.
+ */
+enum pkt_hash_types {
+	PKT_HASH_TYPE_NONE,	/* Undefined type */
+	PKT_HASH_TYPE_L2,	/* Input: src_MAC, dest_MAC */
+	PKT_HASH_TYPE_L3,	/* Input: src_IP, dst_IP */
+	PKT_HASH_TYPE_L4,	/* Input: src_IP, dst_IP, src_port, dst_port */
+};
+
+static inline void
+skb_set_hash(struct sk_buff *skb, __u32 hash, enum pkt_hash_types type)
+{
+#if LINUX_VERSION_IS_GEQ(3,2,0) /* 4031ae6edb */
+	skb->l4_rxhash = (type == PKT_HASH_TYPE_L4);
+#endif
+#if LINUX_VERSION_IS_GEQ(3,4,0) /* bdeab99191 */
+	skb->rxhash = hash;
+#endif
+}
+#endif /* LINUX_VERSION_IS_LESS(3,14,0) */
+
+#if LINUX_VERSION_IS_LESS(3,16,0)
+#define __pskb_copy_fclone LINUX_BACKPORT(__pskb_copy_fclone)
+static inline struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb,
+						 int headroom, gfp_t gfp_mask,
+						 bool fclone)
+{
+	return __pskb_copy(skb, headroom, gfp_mask);
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,18,0)
+#define skb_clone_sk LINUX_BACKPORT(skb_clone_sk)
+struct sk_buff *skb_clone_sk(struct sk_buff *skb);
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,19,0)
+/**
+ * __dev_alloc_pages - allocate page for network Rx
+ * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx
+ * @order: size of the allocation
+ *
+ * Allocate a new page.
+ *
+ * %NULL is returned if there is no free memory.
+*/
+#define __dev_alloc_pages LINUX_BACKPORT(__dev_alloc_pages)
+static inline struct page *__dev_alloc_pages(gfp_t gfp_mask,
+					     unsigned int order)
+{
+	/* This piece of code contains several assumptions.
+	 * 1.  This is for device Rx, therefor a cold page is preferred.
+	 * 2.  The expectation is the user wants a compound page.
+	 * 3.  If requesting a order 0 page it will not be compound
+	 *     due to the check to see if order has a value in prep_new_page
+	 * 4.  __GFP_MEMALLOC is ignored if __GFP_NOMEMALLOC is set due to
+	 *     code in gfp_to_alloc_flags that should be enforcing this.
+	 */
+	gfp_mask |= __GFP_COLD | __GFP_COMP;
+#if LINUX_VERSION_IS_GEQ(3,6,0)
+	gfp_mask |= __GFP_MEMALLOC;
+#endif
+
+	return alloc_pages_node(NUMA_NO_NODE, gfp_mask, order);
+}
+
+#define dev_alloc_pages LINUX_BACKPORT(dev_alloc_pages)
+static inline struct page *dev_alloc_pages(unsigned int order)
+{
+	return __dev_alloc_pages(GFP_ATOMIC, order);
+}
+
+/**
+ * __dev_alloc_page - allocate a page for network Rx
+ * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx
+ *
+ * Allocate a new page.
+ *
+ * %NULL is returned if there is no free memory.
+ */
+#define __dev_alloc_page LINUX_BACKPORT(__dev_alloc_page)
+static inline struct page *__dev_alloc_page(gfp_t gfp_mask)
+{
+	return __dev_alloc_pages(gfp_mask, 0);
+}
+
+#define dev_alloc_page LINUX_BACKPORT(dev_alloc_page)
+static inline struct page *dev_alloc_page(void)
+{
+	return __dev_alloc_page(GFP_ATOMIC);
+}
+#endif /* LINUX_VERSION_IS_LESS(3,19,0) */
+
+#if LINUX_VERSION_IS_LESS(3,19,0)
+#define skb_copy_datagram_msg LINUX_BACKPORT(skb_copy_datagram_msg)
+static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset,
+					struct msghdr *msg, int size)
+{
+	return skb_copy_datagram_iovec(from, offset, msg->msg_iov, size);
+}
+
+#define memcpy_from_msg LINUX_BACKPORT(memcpy_from_msg)
+static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len)
+{
+	return memcpy_fromiovec(data, msg->msg_iov, len);
+}
+
+/**
+ *	skb_put_padto - increase size and pad an skbuff up to a minimal size
+ *	@skb: buffer to pad
+ *	@len: minimal length
+ *
+ *	Pads up a buffer to ensure the trailing bytes exist and are
+ *	blanked. If the buffer already contains sufficient data it
+ *	is untouched. Otherwise it is extended. Returns zero on
+ *	success. The skb is freed on error.
+ */
+#define skb_put_padto LINUX_BACKPORT(skb_put_padto)
+static inline int skb_put_padto(struct sk_buff *skb, unsigned int len)
+{
+	unsigned int size = skb->len;
+
+	if (unlikely(size < len)) {
+		len -= size;
+		if (skb_pad(skb, len))
+			return -ENOMEM;
+		__skb_put(skb, len);
+	}
+	return 0;
+}
+
+#define skb_ensure_writable LINUX_BACKPORT(skb_ensure_writable)
+int skb_ensure_writable(struct sk_buff *skb, int write_len);
+
+#endif /* LINUX_VERSION_IS_LESS(3,19,0) */
+
+#if LINUX_VERSION_IS_LESS(4,2,0)
+static inline void skb_free_frag(void *data)
+{
+	put_page(virt_to_head_page(data));
+}
+
+#if LINUX_VERSION_IS_LESS(3,3,0)
+
+static inline u32 skb_get_hash_perturb(struct sk_buff *skb, u32 key)
+{
+	return 0;
+}
+
+#else
+#include <net/flow_keys.h>
+#include <linux/jhash.h>
+
+static inline u32 skb_get_hash_perturb(struct sk_buff *skb, u32 key)
+{
+	struct flow_keys keys;
+
+	skb_flow_dissect(skb, &keys);
+	return jhash_3words((__force u32)keys.dst,
+			    (__force u32)keys.src ^ keys.ip_proto,
+			    (__force u32)keys.ports, key);
+}
+#endif /* LINUX_VERSION_IS_LESS(3,3,0) */
+#endif /* LINUX_VERSION_IS_LESS(4,2,0) */
+
+#if LINUX_VERSION_IS_LESS(4,13,0)
+static inline void *backport_skb_put(struct sk_buff *skb, unsigned int len)
+{
+	return skb_put(skb, len);
+}
+#define skb_put LINUX_BACKPORT(skb_put)
+
+static inline void *backport_skb_push(struct sk_buff *skb, unsigned int len)
+{
+	return skb_push(skb, len);
+}
+#define skb_push LINUX_BACKPORT(skb_push)
+
+static inline void *backport___skb_push(struct sk_buff *skb, unsigned int len)
+{
+	return __skb_push(skb, len);
+}
+#define __skb_push LINUX_BACKPORT(__skb_push)
+
+static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len)
+{
+	void *tmp = skb_put(skb, len);
+
+	memset(tmp, 0, len);
+
+	return tmp;
+}
+
+static inline void *skb_put_data(struct sk_buff *skb, const void *data,
+				 unsigned int len)
+{
+	void *tmp = skb_put(skb, len);
+
+	memcpy(tmp, data, len);
+
+	return tmp;
+}
+
+static inline void skb_put_u8(struct sk_buff *skb, u8 val)
+{
+	*(u8 *)skb_put(skb, 1) = val;
+}
+#endif
+
+#endif /* __BACKPORT_SKBUFF_H */